U.S. patent application number 09/933658 was filed with the patent office on 2002-04-25 for woody thermoplastic resin composition.
This patent application is currently assigned to AJINOMOTO CO., INC.. Invention is credited to Anzai, Yoshihito, Kubo, Michihiro, Ohno, Hirokazu, Yasuda, Naoki, Yoshimura, Shigeto.
Application Number | 20020049266 09/933658 |
Document ID | / |
Family ID | 18740684 |
Filed Date | 2002-04-25 |
United States Patent
Application |
20020049266 |
Kind Code |
A1 |
Yasuda, Naoki ; et
al. |
April 25, 2002 |
Woody thermoplastic resin composition
Abstract
There is disclosed a woody thermoplastic resin composition which
prevents the occurrence of rust on the metal surface in a molding
machine and suppresses the generation of a volatile substance as
encountered when a woody thermoplastic resin composed of a
thermoplastic resin and wood flour was subjected to heat molding
and processing. According to the present invention, a specific
amount of dolomite is added to a woody thermoplastic resin composed
of a thermoplastic resin and wood flour thereby there may be
obtained a woody thermoplastic resin composition which has an
effect to prevent the occurrence of rust on the metal surface in a
molding machine during the molding and processing and to suppress
the generation of a volatile substance.
Inventors: |
Yasuda, Naoki;
(Kawasaki-shi, JP) ; Anzai, Yoshihito;
(Kawasaki-shi, JP) ; Ohno, Hirokazu;
(Kawasaki-shi, JP) ; Yoshimura, Shigeto;
(Kawasaki-shi, JP) ; Kubo, Michihiro;
(Kawasaki-shi, JP) |
Correspondence
Address: |
OBLON SPIVAK MCCLELLAND MAIER & NEUSTADT PC
FOURTH FLOOR
1755 JEFFERSON DAVIS HIGHWAY
ARLINGTON
VA
22202
US
|
Assignee: |
AJINOMOTO CO., INC.
Tokyo
JP
|
Family ID: |
18740684 |
Appl. No.: |
09/933658 |
Filed: |
August 22, 2001 |
Current U.S.
Class: |
524/13 ; 524/425;
524/436 |
Current CPC
Class: |
C08K 3/26 20130101; C08L
101/00 20130101; C08L 101/00 20130101; C08L 2666/26 20130101 |
Class at
Publication: |
524/13 ; 524/425;
524/436 |
International
Class: |
C08L 001/00; C08K
003/26; C08K 003/10 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 22, 2000 |
JP |
251253/2000 |
Claims
1. A woody thermoplastic resin composition comprising (A) 100 parts
by weight of a thermoplastic resin, (B) 5-20.0 parts by weight of
wood flour and 0.01-20.0 parts by weight based on the total amount
of (A) and (B) components, of a dolomite.
2. The woody thermoplastic resin composition claimed as in claim 1
wherein said dolomite is natural dolomite and/or a synthetic
dolomite composed of magnesium carbonate-calcium carbonate complex
salt.
3. The woody thermoplastic resin composition claimed as in claim 1
or 2 wherein said dolomite is a magnesium carbonate-calcium
carbonate complex salt in which the weight ratio of magnesium to
calcium is 5:95-95:5 in terms of MgO:CaO.
4. The woody thermoplastic resin composition claimed as in claim 1
or 2 wherein said dolomite is a light burned dolomite prepared by
heating at a temperature of 900-1,000.degree. C. a magnesium
carbonate-calcium carbonate complex salt in which the weight ratio
of magnesium to calcium is 5:95-95:5 in terms of MgO:CaO.
5. The woody thermoplastic resin composition claimed as in claim 1
or 2 wherein said dolomite is one subjected to surface treatment
with a surface treatment agent selected from the group consisting
of an organic acid, a metal salt thereof, a polyhydric alcohol, a
silane coupling agent, an aluminum coupling agent, a phosphate
coupling agent, an anionic surfactant, a cationic surfactant, a
nonionic surfactant, a polymeric dispersing agent.
Description
[0001] The present invention relates to a woody thermoplastic resin
composition which is prepared by incorporating a certain specific
additive into a woody thermoplastic resin comprising a
thermoplastic resin and wood flour and which may be widely utilized
in the fields where wood-like appearance is required.
PRIOR ART
[0002] A wood has been extensively used as a construction material.
However, the articles made from wood have disadvantages in their
inherent nature of combustibility, durability, weather resistance,
etc. Also, an environmental disruption by deforestation has become
a serious problem. Under these circumstances, it is well known that
a molded article having a wood-like appearance may be prepared from
a mixture of a thermoplastic resin and wood flour as wood
replacement. In recent years, there have been an increase in the
case where wood flour-containing thermoplastic resin is used as the
interior and exterior materials for house such as floor, ceiling,
banister, window frame, doorframe, veranda and the like.
[0003] However, wood flour-containing thermoplastic resin causes
problems of forming rust on the surface of metals such as screw,
cylinder, mold, etc. in the molding machine during molding
possessing such as extrusion molding or injection molding. In
addition, volatile substance such as the decomposition product of
the resin, water and the like generate during molding processing to
cause problems of foaming the molded article and forming silver
stripe on the surface of the molded article. To prevent these
problems the following techniques were already proposed.
[0004] (1) A technique for prevent rust by a method which comprises
incorporating at least one compound selected from the group
consisting of hydrotalcites, zeolites, alkaline earth metal oxides
or carbonates salts, fibrous magnesium oxysulfates, metal salts of
hydrofatty acids and hindered amine light stabilizers into a
polyolefin composition comprising a polyolefin and a plastic
modifying agent mainly consisting of waste paper pulp (Japanese
Patent Laid-Open No. Hei 11-60830). Among alkaline earth metal
oxides or carbonates salts for use in said technique, oxide or
carbonate of magnesium and calcium are the constituent ingredients
of dolomite involving in the present invention. However, there is
neither description nor suggestion in said prior art reference with
respect to not only dolomite which is a magnesium-calcium complex
salt for use in the present invention but also rust preventive
effect to be caused when dolomite was incorporated into a woody
thermoplastic resin.
[0005] (2) A technique for suppressing the generation of volatile
substances by a method which comprises incorporating rice hull into
a thermoplastic resin composition containing a basic filler such as
magnesium oxide, calcium oxide, calcium carbonate or calcium
hydroxide (Japanese Patent Laid-Open No. Sho 63-202661). Although a
basic filler such as magnesium oxide, calcium oxide, calcium
carbonate or calcium hydroxide for use in said technique are the
constituent ingredients of dolomite involving in the present
invention, there is neither description nor suggestion in said
prior art reference with respect to not only dolomite which is a
magnesium-calcium complex salt for use in the present invention but
also volatile substances-suppressing effect to be caused when
dolomite was incorporated into a woody thermoplastic resin.
[0006] There was practically incorporated into a woody
thermoplastic resin composed of wood flour and thermoplastic resin
an element selected from hydrotalcites, zeolites, alkaline earth
metal oxides or carbonates salts, fibrous magnesium oxysulfates,
metal salts of hydrofatty acids and hindered amine light
stabilizers disclosed in Japanese Patent Laid-Open No. Hei 11-60830
and further the basic filler disclosed in Japanese Patent Laid-Open
No Sho 63-202661. As the results, in any case the rust preventive
effect and volatile substance-reducing effect could not be achieved
sufficiently.
SUMMARY OF THE INVENTION
[0007] An object of the present invention is to provide a woody
thermoplastic resin composition (a wood flour-containing
thermoplastic resin composition) which can prevent the rusting on
the surface of metals including screw, cylinder and mold in the
molding machine and at the same time which can suppress the
generation of the volatile substances during heat molding
processing such as extrusion molding and injection molding.
[0008] As a result of having ardently studied to achieve the above
object, the present inventors have found that a thermoplastic resin
composition comprising incorporating a specific amount of dolomite
into a woody thermoplastic resin composed of a thermoplastic resin
and wood flour in a specific ratio has excellent effect to prevent
the occurrence of rust on the surface of metals including screw,
cylinder and mold in the molding machine and to suppress the
generation of volatile substance during molding processing such as
extrusion molding and injection molding. The present invention is
based on the above finding.
[0009] That is, the present invention is a thermoplastic resin
composition which comprises (A) 100 parts by weight of a
thermoplastic resin, (B) 5-150 parts by weight of wood flour, and
(C) 0.01-20.0 parts by weight, based on the total of the components
(A) and (B), of dolomite and which has excellent rust-preventive
effect on the surface of metals including screw, cylinder and mold
in the molding machine and volatile substances-reducing effect
during molding processing such as extrusion molding and injection
molding.
[0010] Also, by using a thermoplastic resin composition which
comprising (A) 100 parts by weight of a thermoplastic resin, (B)
5-150 parts by weight of wood flour, and (C) 0.01-20.0 parts by
weight, based on the total of the components (A) and (B), of
natural dolomite and/or a synthetic dolomite consisting of
magnesium carbonate-calcium carbonate, the rust preventive and
volatile substances-reducing effects may be enhanced.
[0011] Also, a thermoplastic resin composition comprising (A) 100
parts by weight of a thermoplastic resin, (B) 5-150 parts by weight
of wood flour, and (C) 0.01-20.0 parts by weight, based on the
total of the components (A) and (B), of dolomite consisting of
magnesium carbonate-calcium carbonate complex salt in which the
weight ratio of magnesium to calcium is 5:95-95:5 in terms of
MgO:CaO exerts the increased rust preventive and volatile
substances-reducing effects.
[0012] Furthermore, a thermoplastic resin composition comprising
(A) 100 parts by weight of a thermoplastic resin, (B) 5-150 parts
by weight of wood flour, and (C) 0.01-20.0 parts by weight, based
on the total of the components (A) and (B), of light burned
dolomite prepared by light burning a dolomite consisting of
magnesium carbonate-calcium carbonate complex salt in which the
weight ratio of magnesium to calcium is 5:95-95:5 in terms of
MgO:CaO exerts significantly increased rust preventive and volatile
substances-reducing effects.
[0013] A thermoplastic resin for use in the present invention may
be one which is usually being used. Examples of the thermoplastic
resin include polyvinyl chloride, vinyl chloride-related resin such
as chlorinated polyvinyl chloride, styrene-related resins such as
polystyrene(PS), high-impact polystyrene(HIPS), syndiotactic
polystyrene, acrylonitrile-butadien-styrene copolymer (ABS resin),
acrylonitrile-butadien-styrene- (.alpha.-methyl) styrene copolymer,
acrylonitrile-styrene copolymer (AS resin),
acrylonitrile-ethylene-styren- e copolymer (AES resin),
acrylonitrile-acrylic rubber-styrene copolymer (AAS resin) and the
like; polyesters such as poly(ethylene terephthalate),
poly(butylene terephthalate), polyacrylate and the like; polyamides
such as nylon 6, nylon 12, nylon 66, nylon 610, nylon 612, nylon
MXD6 and the like; polycarbonate, polyacetal, vinyl acetate resin,
ethylene- vinyl acetate resin, poly(vinyl alcohol), poly (vinyl
acetal), polyphenylene oxide, polysulfone, polyether sulfone,
polyphenylene sulfide, their blend resin (polymer alloy), etc.
[0014] Wood flour for use in the present invention may be one which
is generally being used. Examples of wood flour include chip,
shavings, sawdust derived from wood such as hemlock, cypress,
cryptomeria, pine, lauan or the like. These wood flours are being
supplied abundantly as by-product or waste from sawmill and
woodworking plant.
[0015] The particle shape and size of wood flour for use in the
present invention is not particularly limited so long as they are
not adversely affected on the molding processing property and the
quality of the molded article to be prepared. However, an average
particle size of wood flour may be 30-500 .mu.m, preferably 70-200
.mu.m. When the average particle size is less than 30 .mu.m or when
it exceeds 500 .mu.m a good wood-like appearance cannot be
realized.
[0016] The amount added of wood flour for use in the present
invention may be 5-15 parts by weight, preferably 20-100 parts by
weight, based on 100 parts by weight of a thermoplastic resin. In
the case that the amount added of wood flour is less than 5 parts
by weight based on 100 parts by weight of a thermoplastic resin, it
is difficult to obtain the characteristic properties close to
natural wood, e.g. thermal expansivity, nail-driving
characteristics, rigidity, feel such as touch, surface state,
wood-like appearance and the like. Contrary thereto, In the case
that the amount added of wood flour exceeds 150 parts by weight
based on 100 parts by weight of a thermoplastic resin, there can be
obtained the characteristic property close to natural wood, but
wood flour is easily aggregated in a molten thermoplastic resin to
cause problems of build-up and lowering in the physical property
because wood flour and thermoplastic resin have poor compatibility
and dispersibility each other.
[0017] As a dolomite for use in the present invention, it is not
limited particularly. There can be used a natural dolomite which
occurs widely in nature and which has been utilized as wall
material, fireproof material for iron manufacture and the like. In
addition, a synthetic dolomite may also be used whose chemical
composition is a magnesium carbonate-calcium carbonate complex
salt. The composition of the synthetic dolomite for use in the
present invention may be one wherein the magnesium element and the
calcium element are present in a certain mixture ratio, and it is
preferable that the weight ratio of the magnesium component to the
calcium component is in a range of from 5:95 to 95:5 in terms of
MgO:CaO.
[0018] Also, these natural and/or synthetic dolomites may be
subjected to burning or digestion to such an extent that the metal
element composition is not altered greatly thereby the denatured
derivatives may also be used. Specific examples of the denatured
derivatives include dolomite cement prepared by heating natural
dolomite at a temperature of 700-800.degree. C., light burnt
dolomite prepared by heating natural dolomite at a temperature of
900-1,000.degree. C., dead burnt dolomite prepared by heating
natural dolomite at a elevated temperature of 1,600-1,800.degree.
C., dolomitic slaked lime prepared by digesting light burnt
dolomite in the presence of water, synthetic magnesite-dolomite
clinker and the like.
[0019] Furthermore, there may be used the denatured derivatives of
natural minerals and synthetic complex salts such as akermanite
(Ca.sub.2MgSi.sub.2O.sub.7), diopside [CaMg (SiO.sub.7).sub.2],
various kinds of slag to such an extent that the metal element
composition is not altered greatly, the ratio of calcium to
magnesium in said natural minerals and synthetic complex salts
being in the same range as in the above described synthetic
dolomite. Also, they may be used in optionally selected
combination.
[0020] A natural dolomite, a synthetic dolomite and derivatives
thereof are referred to as "dolomitic compound" collectively
herein. These dolomitic compounds are being produced industrially
widely in a large amount and used in a variety of fields including
steel manufacture, earthenware, construction material and
agriculture, and hence they are easily and cheaply available in a
stable quality. Among them, especially light burnt dolomite and
light burnt synthetic dolomite are preferred from a viewpoint of
causing a good rust-preventive effect toward the metal surface and
a good volatile substance-reducing effect during heat molding
processing. In addition, dolomitic compound subjected to surface
treatment with various surface treatment agents to improve the
compatibility and dispersibility of dolomitic compound in wood
flour containing thermoplastic resin are the most preferred from a
viewpoint of causing excellent rust-preventive effect toward the
metal surface and excellent volatile substance-reducing effect
during heat molding processing.
[0021] As surface treatment agents involving in the present
invention, organic acids, metal salts of organic acids, polyhydric
alcohols and the like may be taken. These surface treatment agents
may be used either individually or in optional combination.
[0022] As organic acids which may be used as surface treatment
agent, there may be taken a saturated aliphatic monocarboxylic
acid, a saturated aliphatic dicarboxylic acid, an unsaturated
aliphatic carboxylic acid, a carbon cyclic carboxylic acid, a
heterocyclic carboxylic acid, a hydroxy acid, an amino acid, an
amino acid derivative and the like.
[0023] Examples of specific saturated aliphatic monocarboxylic
acids include acetic acid, propionic acid, butyric acid, valeric
acid, heptoic acid, octanoic acid, lauric acid, stearic acid,
behenic acid and the like.
[0024] Examples of specific saturated aliphatic dicarboxylic acids
include oxalic acid, malonic acid, succinic acid, adipic acid,
sebacic acid and the like.
[0025] Examples of specific unsaturated aliphatic carboxylic acids
include acrylic acid, oleic acid, crotonic acid, fumaric acid and
the like.
[0026] Examples of specific carbon cyclic carboxylic acids include
benzoic acid, camphoric acid, phthalic acid, toluic acid,
hydroatropic acid, cinnamic acid and the like.
[0027] Examples of specific heterocyclic carboxilic acids include
furoic acid, thenoic acid, pyrrolidone carboxylic acid, nicotinic
acid and the like.
[0028] Examples of specific hydroxy acids include lactic acid,
malic acid, benzilic acid, salicylic acid, anisic acid, vanillic
acid, protocatechuic acid, gallic acid and the like.
[0029] Examples of specific amino acids and amino acid derivatives
include glutamic acid, lysine, aspartic acid, glycine,
N-stearoylglycine, N-acetylglutamic acid, N-lauroylleucine,
.gamma.-methylglutamic acid and the like.
[0030] As metal salts of organic acids which may be used as the
surface treatment agent, metal salts of the above described organic
acids may be taken. Examples of specific metals in said metal salts
include zinc, calcium, magnesium, potassium, sodium, lithium,
aluminum, nickel and the like. In addition, these organic acid
metal salts may be mixtures of two or more of them or complex
salts.
[0031] As polyhydric alcohols which may be used as the surface
treatment agent, there may be taken pentaerythritol,
dipentaerythritol, tripentaerythritol, polypentaerythritol,
sorbitol, glycerin, polyglycerin and the like. Also, partially
estrified or etherified products of these polyhydric alcohols are
to be included in the category of polyhydric alcohols defined in
the present invention.
[0032] Also, other surface treatment agents which may be used
industrially may be used, if necessary. Examples of other surface
treatment agents include silane-, aluminum- and phosphate-coupling
agents; anionic, cationic and nonionic surfactants; polymeric
dispersing agents and the like.
[0033] Although the amount used of the surface treatment agent
varies depending on the kind of dolomitic compound, the specific
surface area of its powder particles and the amount of water bonded
to its surface, the surface treatment agent may be used in an
amount of 0.05-40% by weight, preferably 0.1-20% by weight, based
on dolomitic compound to be surface-treated. In the case that the
amount used of the surface treatment agent is less than 0.05% by
weight, almost no surface treatment effect is not achieved while
even when surface treatment agent was used in an amount larger than
40% by weight, no further increase is realized in the surface
treatment effect due to the surface of powdery dolomitic compound
particles being saturated with surface treatment agent.
[0034] The method for surface treatment is not particularly
limited, and examples of the method include (1) a method in which
surface treatment agent is directly added to powdery dolomitic
compound and then pulverized together with a grinder such as
Henschel mixer, colloid mill, ball mill or the like; and (2) a
method in which surface treatment agent and dolomitic compound are
added to a suitable solvent such as toluene, xylene, methyl ethyl
ketone, acetonitrile, chloroform, diethyl ether, water, ethanol,
methanol or the like, mixed under stirring and then the solvent is
removed.
[0035] The amount added of dolomitic compound for use in the
present invention is 0.01-20 parts by weight, preferably 0.1-15.0
parts by weight based on 100 parts of a woody thermoplastic resin
(a wood flour-containing thermoplastic resin). In the case that the
amount added of dolomitic compound is less than 0.01 part by
weight, there is not realized not only effect to prevent the
formation of rust during molding processing such as extrusion
molding and injection but also effect to suppress the generation of
volatile substances. On the other hand, in the case that the amount
added of dolomitic compound exceeds 20.0 parts by weight, there can
be obtained the same level of effect to suppress the generation of
volatile substances as in the case that it is less than 20.0 parts
by weight but there can not be obtained not only the expected
further effect to prevent the formation of rust by increase in the
amount added but also there occurs a problem of lowering in the
physical property of the molded articles.
[0036] The method for adding a dolomitic compound to the wood
flour-containing thermoplastic resin may be conducted by the known
method. For example, a dolomitic compound and wood flour-containing
thermoplastic resin are mixed together with a grinder such as
Henschel mixer, ribbon blender, Banbury mixer or the like, or
otherwise one packed compounding of a thermoplastic resin, wood
flour and a dolomitic compound in advance is mixed with the above
described grinders.
[0037] In addition to the above described ingredients, there may be
used other additives e.g. a heat deterioration preventing agent, an
antioxidant such as a weather-resistant stabilizer including a
ultraviolet absorbing agent, a filler, a dispersing agent, a
foaming agent, a flame retarder, a plasticizer, an antistatic
agent, a reinforcing agent, a processing aid, a pigment and the
like.
[0038] In carrying out the present invention, the following
embodiments are exemplified:
[0039] (1) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 5-150 parts by weight of wood flour and
0.01-20.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound
[0040] (2) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 20-100 parts by weight of wood flour and
0.1-15.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound
[0041] (3) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 5-150 parts by weight of wood flour and
0.01-20.0 parts by weight, based on said woody thermoplastic resin,
of a natural dolomite and/or a synthetic dolomite composed of
magnesium carbonate-calcium carbonate complex salt
[0042] (4) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 5-150 parts by weight of wood flour and
0.01-20.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound composed of complex salt in which the
weight ratio of magnesium to calcium is 5:95-95:5 in terms of
MgO:CaO
[0043] (5) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 5-150 parts by weight of wood flour and
0.01-20.0 parts by weight, based on said woody thermoplastic resin,
of a light burnt dolomite derived from a dolomitic compound
composed of complex salt in which the weight ratio of magnesium to
calcium is 5:95-95:5 in terms of MgO:CaO by heating at a
temperature of 900-1,000.degree. C.
[0044] (6) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 5-150 parts by weight of wood flour and
0.01-20.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound subjected to surface treatment with a
surface treatment agent
[0045] (7) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 20-100 parts by weight of wood flour and
0.1-15.0 parts by weight, based on said woody thermoplastic resin,
of a natural dolomite and/or a synthetic dolomite composed of a
magnesium carbonate-calcium carbonate complex salt
[0046] (8) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 20-100 parts by weight of wood flour and
0.1-15.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound composed of a complex salt in which the
weight ratio of magnesium to calcium is 5:95-95:5 in terms of
MgO:CaO
[0047] (9) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 parts by weight of a
thermoplastic resin and 20-100 parts by weight of wood flour and
0.1-15.0 parts by weight, based on said woody thermoplastic resin,
of a light burnt dolomite produced by lightly burning a dolomitic
compound at a temperature of 900.degree. C.-1,000.degree. C., said
dolomitic compound being a complex salt in which the weight ratio
of magnesium to calcium is 5:95-95:5 in terms of MgO:CaO
[0048] (10) A woody thermoplastic resin composition comprising a
woody thermoplastic resin comprising 100 part by weight of a
thermoplastic resin and 20-100 parts by weight of wood flour and
0.1-15.0 parts by weight, based on said woody thermoplastic resin,
of a dolomitic compound subjected to surface treatment with a
surface treatment agent.
[0049] The preferred embodiments of the present invention are the
above ones (2)-(10), more preferred embodiments being the above
ones (4)-(6), (8)-(10), especially preferred embodiments being (5),
(6), (9) and (10), the most preferred embodiment being the above
one (10).
[0050] The following Examples illustrate the present invention
specifically but the present invention is not limited thereto. In
the Examples, the term "part" means part by weight.
SYNTHESIS EXAMPLE 1
[0051] 6.9 Parts of magnesium hydroxide and 121.3 parts of calcium
hydroxide were added to 2,000 parts of water and then carbon
dioxide was bubbled therein at 10.degree. C. for 3 hours under
stirring. The formed precipitate was filtered out and dried at
50.degree. C. in an atmosphere of carbon dioxide to obtain 143.6
parts of a magnesium carbonate-calcium carbonate complex salt
(synthetic dolomite). The weight ratio of magnesium to calcium in
the obtained complex salt was 5:95 in terms of MgO:CaO.
SYNTHESIS EXAMPLE 2
[0052] 131.9 Parts of magnesium hydroxide and 6.4 parts of calcium
hydroxide were added to 2,000 parts of water and then carbon
dioxide was bubbled therein at 10.degree. C. for 3 hours under
stirring. The formed precipitate was filtered out and dried at
50.degree. C. in an atmosphere of carbon dioxide to obtain 164.6
parts of a magnesium carbonate-calcium carbonate complex salt
(synthetic dolomite). The weight ratio of magnesium to calcium in
the obtained complex salt was 95:5 in terms of MgO:CaO.
SYNTHESIS EXAMPLE 3
[0053] 58.3 Parts of magnesium hydroxide and 74.1 parts of calcium
hydroxide were added to 2,000 parts of water and then carbon
dioxide was bubbled therein at 10.degree. C. for 3 hours under
stirring. The formed precipitate was filtered out and dried at
50.degree. C. in an atmosphere of carbon dioxide to obtain 152.3
parts of a magnesium carbonate-calcium carbonate complex salt
(synthetic dolomite). The weight ratio of magnesium to calcium in
the obtained complex salt was 46:54 in terms of MgO:CaO.
SYNTHESIS EXAMPLE 4
[0054] The synthetic dolomite obtained in Synthesis Example 1 was
burnt at 1,000.degree. C. for 1 hour to yield light burnt
dolomite.
SYNTHESIS EXAMPLE 5
[0055] 1.9 Kilograms of the light burnt synthetic dolomite obtained
in Synthesis Example 4 was pulverized together with 0. 1 kg of
calcium stearate under a deaerated and dry condition over 24 hours.
The median diameter of the obtained light burnt synthetic dolomite
subjected to surface treatment with calcium stearate was 1.1
.mu.m.
SYNTHESIS EXAMPLE 6
[0056] 19.6 Kilograms of unpulverized dolomite (a product of Tagen
Lime Industry Co., Ltd.) was pulverized together with 0.4 kg of
calcium stearate under deaerated and dry condition over 24 hours.
The median diameter of the obtained synthetic dolomite subjected to
the surface treatment with calcium stearate was 1.2 .mu.m.
SYNTHESIS EXAMPLE 7
[0057] 19.6 Kilograms of light burnt dolomite (a product of Tagen
Lime Industry Co., Ltd.) was pulverized together with 1.0 kg of
calcium stearate under deaerated and dry condition over 24 hours.
The median diameter of the obtained light burnt synthetic dolomite
subjected to the surface treatment with calcium stearate was 1.1
.mu.m.
[0058] [Additives for use in the Present Invention]
[0059] A-1: Surface untreated and pulverized dolomite (a product of
Tagen Lime Industry Co., Ltd.)
[0060] A-2: Surface untreated and pulverized light burnt dolomite
(a product of Tagen Lime Industry Co., Ltd.)
[0061] A-3: Surface untreated and pulverized dolimitic slaked lime
(a product of Tagen Lime Industry Co., Ltd.)
[0062] A-4: Surface untreated and pulverized dolomite prepared by
Synthesis Example 1:
[0063] A-5: Surface untreated and pulverized dolomite prepared by
Synthesis Example 2
[0064] A-6: Surface untreated and pulverized dolomite prepared by
Synthesis Example 3
[0065] A-7: Surface untreated, pulverized and light burnt dolomite
prepared by Synthesis Example 4
[0066] A-8: Surface treated, pulverized and light burnt dolomite
prepared by Synthesis Example 5
[0067] A-9: Surface treated and pulverized dolomite prepared by
Synthesis Example 6
[0068] A-10: Surface treated, pulverized and light burnt dolomite
prepared by Synthesis Example 7
[0069] [Control Additives]
[0070] B-1: Magnesium oxide
[0071] B-2: Calcium oxide
[0072] B-3: Magnesium carbonate
[0073] B-4: Calcium carbonate
[0074] B-5: Magnesium hydroxide
[0075] B-6: Calcium hydroxide
[0076] B-7: Magnesium stearate
[0077] B-8: Calcium stearate
[0078] B-9: Calcium 12-hydroxystearate
[0079] B-10: Synthetic hydrotalcite (a trade name "DHT-4A", a
product of Kyowa Chemical Industry Co., Ltd.)
[0080] B-11: Synthetic hydrotalcite (a trade name "Alcamizer", a
product of Kyowa Chemical Industry Co., Ltd.)
[0081] B-12: Synthetic hydrotalcite (a trade name "Toyobuilder", a
product of Tosoh Corporation)
[0082] B-13: Fibrous magnesium hydroxysulphate (a trade name
"Mosheiji", a product of Ube Industries, Ltd.)
[0083] B-14: hindered amine stabilizer (a trade name "Sanol
LS-770", a product of Sankyo Company, Limited)
EXAMPLE 1
[0084] 100 Parts of polyvinyl chloride (a trade name "ZEST 1,000Z",
a product of Shin Dai-ichi Vinyl Corporation), 20 parts of wood
flour (a product of Kaneki Fuel Co., Ltd.), and an additive shown
in tables 1-4 were mixed sufficiently and the resultant composition
was kneaded for 3 minutes by a 8-inch test roll mill heated to
160.degree. C. and then rolled into a sheet having a thickness of
0.5 mm.
[0085] (Rusting Test)
[0086] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block_set to 190.degree. C., and then the occurring state
of rust on the nail after 30 minutes was visually evaluated.
[0087] The occurrence state of rust on the nail was evaluated
according to the following criterion.
[0088] .circleincircle.: No occurrence of rust on the nail
[0089] .smallcircle.: Slight occurrence of rust on the nail
[0090] .DELTA.: Occurrence of rust on about 50% or less of the
surface of the nail
[0091] .times.: Occurrence of rust on about 50% or more of the
surface of the nail
[0092] .times..times.: Occurrence of rust on the whole surface of
the nail
[0093] (Volatility Test)
[0094] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 190.degree. C., and the foaming state of the
sheet after 30 minutes was visually evaluated.
[0095] The foaming state of the sheet was evaluated according to
the following criterion.
[0096] .circleincircle.: No foaming on the surface of the sheet
[0097] .smallcircle.: Slight foaming on the surface of the
sheet
[0098] .DELTA.: Foaming on about 50% or less of the surface of the
sheet
[0099] .times.: Foaming on about 50% or more of the surface of the
sheet
[0100] .times..times.: Foaming on the whole surface of the
sheet
1TABLE 1 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 1 A-1 0.1 .largecircle. .largecircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-3 0.1 .largecircle. .DELTA. 4
A-4 0.1 .largecircle. .largecircle. 5 A-5 0.1 .largecircle.
.largecircle. 6 A-6 0.1 .largecircle. .largecircle. 7 A-7 0.1
.circleincircle. .circleincircle. 8 A-8 0.1 .circleincircle.
.circleincircle. 9 A-9 0.1 .circleincircle. .circleincircle. 10
A-10 0.1 .circleincircle. .circleincircle. 11 A-1 5.0
.circleincircle. .largecircle. 12 A-2 5.0 .circleincircle.
.circleincircle. 13 A-3 5.0 .circleincircle. .largecircle. 14 A-4
5.0 .largecircle. .largecircle. 15 A-5 5.0 .largecircle.
.largecircle. 16 A-6 5.0 .circleincircle. .largecircle. 17 A-7 5.0
.circleincircle. .circleincircle. 18 A-8 5.0 .circleincircle.
.circleincircle. 19 A-9 5.0 .circleincircle. .circleincircle. 20
A-10 5.0 .circleincircle. .circleincircle. 21 A-1 15.0
.circleincircle. .largecircle. 22 A-2 15.0 .circleincircle.
.circleincircle. 23 A-3 15.0 .circleincircle. .largecircle. 24 A-4
15.0 .largecircle. .largecircle. 25 A-5 15.0 .largecircle.
.largecircle. 26 A-6 15.0 .circleincircle. .largecircle. 27 A-7
15.0 .circleincircle. .circleincircle.
[0101]
2TABLE 2 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 28 A-8 15.0 .circleincircle. .circleincircle. 29 A-9 15.0
.circleincircle. .circleincircle. 30 A-10 15.0 .circleincircle.
.circleincircle. 31 A-2 20.0 .circleincircle. .circleincircle. 32
A-7 20.0 .circleincircle. .circleincircle. 33 A-2 25.0 .DELTA.
.circleincircle. 34 A-7 25.0 .DELTA. .circleincircle. 35 A-2 0.005
XX XX 36 A-7 0.005 XX XX 37 B-1 0.1 X X 38 B-2 0.1 X X 39 B-3 0.1 X
XX 40 B-4 0.1 X XX 41 B-5 0.1 X X 42 B-6 0.1 X X 43 B-7 0.1 XX XX
44 B-8 0.1 XX XX 45 B-9 0.1 XX XX 46 B-10 0.1 X X 47 B-11 0.1 X X
48 B-12 0.1 X X 49 B-13 0.1 XX XX 50 B-14 0.1 XX XX 51 B-1 5.0 X X
52 B-2 5.0 X X 53 B-3 5.0 X XX 54 B-4 5.0 X XX
[0102]
3TABLE 3 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 55 B-5 5.0 X X 56 B-6 5.0 X X 57 B-7 5.0 XX XX 58 B-8 5.0
XX XX 59 B-9 5.0 XX XX 60 B-10 5.0 X XX 61 B-11 5.0 X XX 62 B-12
5.0 X XX 63 B-13 5.0 XX XX 64 B-14 5.0 XX XX 65 B-1 15.0 X X 66 B-2
15.0 X X 67 B-3 15.0 X XX 68 B-4 15.0 X XX 69 B-5 15.0 X X 70 B-6
15.0 X X 71 B-7 15.0 XX XX 72 B-8 15.0 XX XX 73 B-9 15.0 XX XX 74
B-10 15.0 .DELTA. XX 75 B-11 15.0 .DELTA. XX 76 B-12 15.0 X XX 77
B-13 15.0 XX XX 78 B-14 15.0 XX XX 79 B-1 0.05 X X B-2 0.05 80 B-3
0.05 X XX B-4 0.05
[0103]
4TABLE 4 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 81 B-5 0.05 X X B-6 0.05 82 B-1 2.5 X X B-2 2.5 83 B-3
2.5 X XX B-4 2.5 84 B-5 2.5 X X B-6 2.5 85 B-1 7.5 X X B-2 7.5 86
B-3 7.5 X XX B-4 7.5 87 B-5 7.5 X X B-6 7.5 88 No Addition XX
XX
[0104] Sample Nos. 1-32 are Examples involving in the present
invention while Sample Nos. 33-88 are Comparative Examples. The
comparison among the results shown in tables 1-4 revealed that the
woody thermoplastic resin composition of the present invention has
not only superior effect to prevent the occurrence of rust on the
metal surface to the control composition but also superior effect
to suppress to the generation of the volatile substances to the
control composition. In spite of the additives involving in the
present invention like Sample Nos. 33 and 34, each sample was used
in an amount exceeding the upper limitation of 20.0 parts based on
the total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
in spite of the additives involving in the present invention like
Sample Nos. 35 and 36, each sample was used in an amount smaller
than the lower limitation of 0.01 part based on the total amount of
the woody thermoplastic resin. Were used other additives not to
involve in the present invention like Sample Nos. 37-87; a
magnesium compound and a calcium compound were used together
without forming their complex salt like Sample Nos. 79-87; no
additive was used like Sample No. 88. In every case, there cannot
be achieved sufficient rust-preventive effect toward the metal and
volatile substance-reducing effect.
EXAMPLE 2
[0105] 100 Parts of polystyrene (a trade name "STYRON685D", a
product of Dow Chemical Company), 20 parts of wood flour (a product
of Kaneki Fuel Co., Ltd.), 0.3 part of polystyrene wax (a trade
name "HI-WAX 400PF", a product of Mitsui Chemicals Inc.) and a
prescribed amount of an additive shown in tables 5 and 6 were
sufficiently mixed together and the resultant mixture was kneaded
for 3 minutes by a 8-inch test roll mill heated to 150.degree. C.
and then rolled into a sheet having a thickness of 0.5 mm.
[0106] (Rusting Test)
[0107] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 200.degree. C., and then the occurrence state
of rust on the nail after 30 minutes was visually evaluated.
[0108] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0109] (Volatility Test)
[0110] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 200.degree. C., and the foaming state of the
sheet after 30 minutes was visually evaluated.
[0111] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
5TABLE 5 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 1 A-1 0.1 .largecircle. .largecircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-7 0.1 .circleincircle.
.circleincircle. 4 A-10 0.1 .circleincircle. .circleincircle. 5 A-1
5.0 .circleincircle. .largecircle. 6 A-2 5.0 .circleincircle.
.circleincircle. 7 A-7 5.0 .circleincircle. .circleincircle. 8 A-10
5.0 .circleincircle. .circleincircle. 9 A-1 15.0 .circleincircle.
.largecircle. 10 A-2 15.0 .circleincircle. .circleincircle. 11 A-7
15.0 .circleincircle. .circleincircle. 12 A-10 15.0
.circleincircle. .circleincircle. 13 A-2 25.0 .DELTA.
.circleincircle. 14 A-7 25.0 .DELTA. .circleincircle. 15 B-3 0.1 X
XX 16 B-4 0.1 X XX 17 B-10 0.1 X X 18 B-3 5.0 X XX 19 B-4 5.0 X XX
20 B-10 5.0 X XX
[0112]
6TABLE 6 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 21 B-3 15.0 X XX 22 B-4 15.0 X XX 23 B-10 15.0 .DELTA. XX
24 B-3 0.05 X XX B-4 0.05 25 B-3 2.5 X XX B-4 2.5 26 B-3 7.5 X XX
8-4 7.5 27 No Addition XX XX
[0113] Sample Nos. 1-12 are Examples involving in the present
invention while sample Nos. 13-27 are Comparative Examples. It can
be seen from the results shown in tables 5 and 6 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like Sample Nos. 3 and 14, each sample was used in an
amount exceeding the upper limitation of 20.0 parts based on the
total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
were used other additives not to involve in the present invention
like Sample Nos. 15-23; a magnesium compound and a calcium compound
were used together without forming their complex salt like Sample
Nos. 24-26; and no additive was used like Sample No. 27. In every
case, there cannot be achieved sufficient rust-preventive effect
toward the metal and volatile substance-reducing effect.
EXAMPLE 3
[0114] 100 Parts of polypropylene (a trade name "SK-71 1", a
product of Showa Denko K.K.), 20 parts of wood flour (a product of
Kaneki Fuel Co., Ltd.), 2 parts of barium stearate and a prescribed
amount of an additive shown in tables 7 and 8 were sufficiently
mixed together and the resultant mixture was kneaded for 3 minutes
by a 8-inch test roll mill heated to 180.degree. C. and then rolled
into a sheet having a thickness of 0.5 mm.
[0115] (Rusting Test)
[0116] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 200.degree. C., and then the occurrence state
of rust on the nail after 30 minutes was visually evaluated.
[0117] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0118] (Volatility Test)
[0119] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 200.degree. C., and the foaming state of the
sheet after 20 minutes was visually evaluated.
[0120] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
7TABLE 7 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 1 A-1 0.1 .largecircle. .largecircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-7 0.1 .circleincircle.
.circleincircle. 4 A-10 0.1 .circleincircle. .circleincircle. 5 A-1
5.0 .circleincircle. .largecircle. 6 A-2 5.0 .circleincircle.
.circleincircle. 7 A-7 5.0 .circleincircle. .circleincircle. 8 A-10
5.0 .circleincircle. .circleincircle. 9 A-1 15.0 .circleincircle.
.largecircle. 10 A-2 15.0 .circleincircle. .circleincircle. 11 A-7
15.0 .circleincircle. .circleincircle. 12 A-10 15.0
.circleincircle. .circleincircle. 13 A-2 25.0 .DELTA.
.circleincircle. 14 A-7 25.0 .DELTA. .circleincircle. 15 B-3 0.1 X
XX 16 B-4 0.1 X XX 17 B-10 0.1 X X 18 B-3 5.0 X XX 19 B-4 5.0 X XX
20 B-10 5.0 X XX
[0121]
8TABLE 8 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 21 B-3 15.0 X XX 22 B-4 15.0 X XX 23 B-10 15.0 .DELTA. XX
24 B-3 0.05 X XX B-4 0.05 25 B-3 2.5 X XX B-4 2.5 26 B-3 7.5 X XX
B-4 7.5 27 No Addition XX XX
[0122] Sample Nos. 1-10 are Examples involving in the present
invention while sample Nos. 11-28 are Comparative Examples. It can
be seen from the results shown in tables 7 and 8 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like sample Nos. 13 and 14, each sample was used in an
amount exceeding the upper limitation of 20.0 parts based on the
total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
were used other additives not to involve in the present invention
like Sample Nos. 15-23; a magnesium compound and a calcium compound
were used together without forming their complex salt like sample
Nos. 24-26; and no additive was used like sample No. 27. In every
case, there cannot be achieved sufficient rust-preventive effect
toward the metal and volatile substance-reducing effect.
EXAMPLE 4
[0123] 100 Parts of polyvinyl chloride (a trade name "ZEST 1,000Z",
a product of Shin Dai-ichi Vinyl Corporation), 100 parts of wood
flour (a product of Kaneki Fuel Co., Ltd.), and a certain amount of
an additive shown in tables 9 and 10 were mixed sufficiently and
the resultant composition was kneaded for 3 minutes by a 8-inch
test roll mill heated to 160.degree. C. and then rolled into a
sheet having a thickness of 0.5 mm.
[0124] (Rusting Test)
[0125] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 190.degree. C., and then the occurring state
of rust on the nail after 30 minutes was visually evaluated.
[0126] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0127] (Volatility Test)
[0128] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 200.degree. C., and the foaming state of the
sheet after 20 minutes was visually evaluated.
[0129] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
9TABLE 9 Sample Amount Added Rusting Volatility No. Additive (Part)
Test Test 1 A-1 0.1 .largecircle. .largecircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-7 0.1 .circleincircle.
.circleincircle. 4 A-10 0.1 .circleincircle. .circleincircle. 5 A-1
5.0 .circleincircle. .largecircle. 6 A-2 5.0 .circleincircle.
.circleincircle. 7 A-7 5.0 .circleincircle. .circleincircle. 8 A-10
5.0 .circleincircle. .circleincircle. 9 A-1 15.0 .circleincircle.
.largecircle. 10 A-2 15.0 .circleincircle. .circleincircle. 11 A-7
15.0 .circleincircle. .circleincircle. 12 A-10 15.0
.circleincircle. .circleincircle. 13 A-2 25.0 .DELTA.
.circleincircle. 14 A-7 25.0 .DELTA. .circleincircle. 15 B-3 0.1 XX
XX 16 B-4 0.1 XX XX 17 B-10 0.1 XX XX 18 B-3 5.0 XX XX 19 B-4 5.0
XX XX 20 B-10 5.0 X XX
[0130]
10TABLE 10 Sample Amount Added Rusting Volatility No. Additive
(Part) Test Test 21 B-3 15.0 X XX 22 B-4 15.0 X XX 23 B-10 15.0 X
XX 24 B-3 0.05 XX XX B-4 0.05 25 B-3 2.5 XX XX B-4 2.5 26 B-3 7.5 X
XX B-4 7.5 27 No Addition XX XX
[0131] Sample Nos. 1-12 are Examples involving in the present
invention while sample Nos. 13-27 are Comparative Examples. It can
be seen from the results shown in tables 9 and 10 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like Sample Nos. 13 and 14, each sample was used in an
amount exceeding the upper limitation of 20.0 parts based on the
total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
were used other additives not to involve in the present invention
like Sample Nos. 15-23; a magnesium compound and a calcium compound
were used together without forming their complex salt like Sample
Nos. 24-26; and no additive was used like Sample No. 27. In every
case, there cannot be achieved sufficient rust-preventive effect
toward the metal and volatile substance-reducing effect.
EXAMPLE 5
[0132] 100 Parts of polystyrene (a trade name "STYRON685D", a
product of Dow Chemical Company), 100 parts of wood flour (a
product of Kaneki Fuel Co., Ltd.), 0.3 part of polystyrene wax (a
trade name "HI-WAX 400PF", a product of Mitsui Chemicals Inc.) and
a prescribed amount of an additive shown in tables 11 and 12 were
sufficiently mixed together and the resultant mixture was kneaded
for 3 minutes by a 8-inch test roll mill heated to 150.degree. C.
and then rolled into a sheet having a thickness of 0.5 mm.
[0133] (Rusting Test)
[0134] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 200.degree. C., and then the occurrence state
of rust on the nail after 30 minutes was visually evaluated.
[0135] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0136] (Volatility Test)
[0137] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 200.degree. C., and the foaming state of the
sheet after 30 minutes was visually evaluated.
[0138] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
11TABLE 11 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 1 A-1 0.1 .smallcircle. .smallcircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-7 0.1 .circleincircle.
.circleincircle. 4 A-10 0.1 .circleincircle. .circleincircle. 5 A-1
5.0 .circleincircle. .smallcircle. 6 A-2 5.0 .circleincircle.
.circleincircle. 7 A-7 5.0 .circleincircle. .circleincircle. 8 A-10
5.0 .circleincircle. .circleincircle. 9 A-1 15.0 .circleincircle.
.smallcircle. 10 A-2 15.0 .circleincircle. .circleincircle. 11 A-7
15.0 .circleincircle. .circleincircle. 12 A-10 15.0
.circleincircle. .circleincircle. 13 A-2 25.0 .DELTA.
.circleincircle. 14 A-7 25.0 .DELTA. .circleincircle. 15 B-3 0.1 xx
xx 16 B-4 0.1 xx xx 17 B-10 0.1 xx xx 18 B-3 5.0 xx xx 19 B-4 5.0
xx xx 20 B-10 5.0 x xx
[0139]
12TABLE 12 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 21 B-3 15.0 x xx 22 B-4 15.0 x xx 23 B-10 15.0
.DELTA. xx 24 B-3 0.05 xx xx B-4 0.05 25 B-3 2.5 xx xx B-4 2.5 26
B-3 7.5 x xx B-4 7.5 27 No Addition xx xx
[0140] Sample Nos. 1-12 are Examples involving in the present
invention while sample Nos. 13-27 are Comparative Examples. It can
be seen from the results shown in tables 11 and 12 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like Sample Nos. 13 and 14, each sample was used in an
amount exceeding the upper limitation of 20.0 parts based on the
total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
were used other additives not to involve in the present invention
like Sample Nos. 15-23; a magnesium compound and a calcium compound
were used together without forming their complex salt like Sample
Nos. 24-26; and no additive was used like Sample No. 27. In every
case, there cannot be achieved sufficient rust-preventive effect
toward the metal and volatile substance-reducing effect.
EXAMPLE 6
[0141] 100 Parts of polypropylene (a trade name "SK-711", a product
of Showa Denko K.K.), 100 parts of wood flour (a product of Kaneki
Fuel Co., Ltd.), 2 parts of barium stearate and a prescribed amount
of an additive shown in tables 13 and 14 were sufficiently mixed
together and the resultant mixture was kneaded for 3 minutes by a
8-inch test roll mill heated to 180.degree. C. and then rolled into
a sheet having a thickness of 0.5 mm.
[0142] (Rusting Test)
[0143] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 200.degree. C., and then the occurrence state
of rust on the nail after 30 minutes was visually evaluated.
[0144] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0145] (Volatility Test)
[0146] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 200.degree. C., and the foaming state of the
sheet after 20 minutes was visually evaluated.
[0147] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
13TABLE 13 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 1 A-1 0.1 .smallcircle. .smallcircle. 2 A-2 0.1
.circleincircle. .circleincircle. 3 A-7 0.1 .circleincircle.
.circleincircle. 4 A-10 0.1 .circleincircle. .circleincircle. 5 A-1
5.0 .circleincircle. .smallcircle. 6 A-2 5.0 .circleincircle.
.circleincircle. 7 A-7 5.0 .circleincircle. .circleincircle. 8 A-10
5.0 .circleincircle. .circleincircle. 9 A-1 15.0 .circleincircle.
.smallcircle. 10 A-2 15.0 .circleincircle. .circleincircle. 11 A-7
15.0 .circleincircle. .circleincircle. 12 A-10 15.0
.circleincircle. .circleincircle. 13 A-2 25.0 .DELTA.
.circleincircle. 14 A-7 25.0 .DELTA. .circleincircle. 15 B-3 0.1 xx
xx 16 B-4 0.1 xx xx 17 B-10 0.1 xx xx 18 B-3 5.0 xx xx 19 B-4 5.0
xx xx 20 B-10 5.0 x xx
[0148]
14TABLE 14 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 21 B-3 15.0 x xx 22 B-4 15.0 x xx 23 B-10 15.0 x xx
24 B-3 0.05 xx xx B-4 0.05 25 B-3 2.5 xx xx B-4 2.5 26 B-3 7.5 x xx
B-4 7.5 27 No Addition xx xx
[0149] Sample Nos. 1-12 are Examples involving in the present
invention while sample Nos. 13-27 are Comparative Examples. It can
be seen from the results shown in tables 13 and 14 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like Sample Nos. 13 and 14, when each sample was used in
an amount exceeding the upper limitation of 20.0 parts based on the
total amount of the woody thermoplastic resin, sufficient
rust-preventive effect toward the metal can not be achieved. Also,
were used other additives not to involve in the present invention
like Sample Nos. 15-23; a magnesium compound and a calcium compound
were used together without forming their complex salt like Sample
Nos. 24-26; and no additive was used like Sample No. 27. In every
case, there cannot be achieved sufficient rust-preventive effect
toward the metal and volatile substance-reducing effect.
EXAMPLE 7
[0150] 100 Parts of polyvinyl chloride (a trade name "ZEST 1,000Z",
a product of Shin Dai-ichi Vinyl Corporation), 20 parts of wood
flour (a product of Kaneki Fuel Co., Ltd.), and an additive shown
in tables 1-4 were mixed sufficiently and the resultant composition
was kneaded for 3 minutes by a 8-inch test roll mill heated to
160.degree. C. and then rolled into a sheet having a thickness of
0.5 mm.
[0151] (Rusting Test)
[0152] The obtained sheet having a thickness of 0.5 mm was cut into
pellets, each having 3 mm square. 5 Grams of the pellets and a nail
were placed in a test tube and the test tube was placed in a
heating block set to 180.degree. C., and then the occurrence state
of rust on the nail after 15 minutes was visually evaluated.
[0153] The occurrence state of rust on the nail was evaluated
according to the similar criterion as in Example 1.
[0154] (Volatility Test)
[0155] The obtained sheet having a thickness of 0.5 mm was cut into
small size of sheets, each having 70 mm square. Said sheet was
packed with an aluminum foil and then placed in a Geer's aging
tester maintained to 190.degree. C., and the foaming state of the
sheet after 10 minutes was visually evaluated.
[0156] The foaming state of the sheet was evaluated according to
the similar criterion as in Example 1.
15TABLE 15 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 1 A-1 0.01 .smallcircle. .smallcircle. 2 A-2 0.01
.circleincircle. .circleincircle. 3 A-3 0.01 .smallcircle. .DELTA.
4 A-4 0.01 .smallcircle. .DELTA. 5 A-5 0.01 .smallcircle.
.smallcircle. 6 A-6 0.01 .smallcircle. .smallcircle. 7 A-7 0.01
.circleincircle. .circleincircle. 8 A-8 0.01 .circleincircle.
.circleincircle. 9 A-9 0.01 .smallcircle. .circleincircle. 10 A-10
0.01 .circleincircle. .circleincircle. 11 A-2 0.005 x x 12 A-7
0.005 x x 13 B-1 0.01 xx xx 14 B-2 0.01 xx xx 15 B-3 0.01 xx xx 16
B-4 0.01 xx xx 17 B-5 0.01 xx xx 18 B-6 0.01 xx xx 19 B-7 0.01 xx
xx 20 B-8 0.01 xx xx
[0157]
16TABLE 16 Sample Amount Added No. Additive (Part) Rusting Test
Volatility Test 21 B-9 0.01 xx xx 22 B-10 0.01 xx x 23 B-11 0.01 xx
x 24 B-12 0.01 xx xx 25 B-13 0.01 xx xx 26 B-14 0.01 xx xx 27 B-3
0.005 xx xx B-4 0.005 28 No Addition xx xx
[0158] Sample Nos. 1-10 are Examples involving in the present
invention while sample Nos. 11-28 are Comparative Examples. It can
be seen from the results shown in tables 15 and 16 that the woody
thermoplastic resin composition of the present invention has not
only superior effect to prevent the occurrence of rust on the metal
surface to the control composition but also superior effect to
suppress the generation of the volatile substances to the control
composition. In spite of the additives involving in the present
invention like Sample Nos. 11 and 12, each sample was used in an
amount smaller than the lower limitation of 0.01 part based on the
total amount of the woody thermoplastic resin; were used other
additives not to involve in the present invention like sample Nos.
13-26; a magnesium compound and a calcium compound were used
together without constituting their complex salt like Sample No.
27; and no additive was used like Sample No. 28. In every case,
there cannot be achieved sufficient rust-preventive effect toward
the metal and volatile substance-reducing effect.
EFFECT OF THE INVENTION
[0159] A woody thermoplastic resin composition of the present
invention is significantly excellent in effect to prevent the
occurrence of rust on the metal surface and to suppress the
generation of the volatile substances in comparison with the prior
arts.
* * * * *